As I understand it
2.25 & 2.45 gears for the smaller 8 1/4, -several here on FABO have said that the 1997 + newer 8 1/4 axles will hold these gears or the later axle gears will fit in these cases. One way (or the other) is what I have heard. But with the lesser size inside this econo 8 1/4, it’s probably 2.71 or small gears that fit.
2.71, 2.94, 3.21, 3.55, 3.73, 3.91 for the 60’s through 1996 8 1/4 axles
older axles are 27 spline
Newer axles are 29 spline
When Ordering parts It is important to know which you have.
Previously I had a hard time distinguishing/finding older, 27 spline sure-grip rebuild kits vice 29 spline kits.
As for operating a double overdrive (a833 O/D + 2.45)
GM does it regularly with a T-56 utilizing a .5 overdrive-typically in front of 3.73 gears.
Combined 1.865 GM final gear ratio vice .73 X 2.45 = 1.7885 final ratio.
People driving vettes with a t-56 have squeezed over 25mpg with the .5 X 3.73 gears on the highway.
I was hoping to negate the steep 2.45 gears with a tall 3.49 gear from an NV3500 like a b body guy on the sister site did.
the point Rusty is moot as I am going through divorce, raising/paying for my kid, and closing on a house in a few months-my Mopar progress, aka budget is nearly standstill.
After taxes and school money next year, I’ll be good. And the divorce by the grace of GOD is actually divine. She doesn’t want my retirement, I get to see my kid, and now she is
Confessing to me that she doesn’t know where her pay checks are going (dozens of small junk purchases). I am better off.
